Drill-chuck.



No. 771,626. PATENTED OCT. 4, 1904 G. H. GILMAN.

DRILL CHUCK.

APPLIOATION FILED 1320.16. 1903. NO MODEL.

W A GEORGE mmmm & M 4

atto'omaq Patented October 4, 1904.

GEORGE H. GILMAN, OF FRANKLIN, PENNSYLVANIA.

' DRILL-CHUCK.

SPECIFICATION forming part of Letters Patent No. 771,626, dated October 4, 1904. Application filed December l6 1903. Sierial No. 185,451. (No model.)

To all whom it may concern/.-

Be it known that I, GEORGE H. GILMAN, a citizen of Canada, residing at Franklin, in the county of Venango and State of Pennsylvania, have invented certain new and useful Improvements in Drill-Chucks, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to an improved chuck for rock-drills, and will be fully understood from the following specification, reference being had to the accompanying drawings, forming a part thereof, and which are sufficiently full, clear, and exact to enable those skilled in the art to which it appertains to make and use the same. I

In said drawings, Figure 1 is an elevation, partly in section, of a chuck which embodies my invention. Fig. 2 is a section on line 2 2 of Fig. I. Fig. 3 is an elevation of my locking-pin, the spring-clamp which holds the same in place being here shown in section. Fig. 4 is an end view of Fig. 3. Fig. 5 is a section of my chuck at the line 2 2 with the bit and locking-pin removed.

The same reference-numerals indicate identical parts in the several views.

The main object of my device is to provide a cheap, durable, eificient, and convenient locking device for the bit of a rock-drill and one which will allow a certain amount of longitudinal movement of the bit within the chuck.

The construction of my device is substantially as follows: The chuck 2 has a hole -1 drilled transversely through the same, which hole 1 intersects a hexagonal socket 3 at one side thereof, so that when the locking-pin L is inserted in the hole 1 (see Fig. 2) it occupies a portion of said socket 3. The drill-bit 5 is cut away or relieved at one side in such a manner that said relief 6 registers with the hole 1 in the chuck when the drill is in place and permits the pin 4 to be readily inserted. Said relief 6 is somewhat elongated for the purpose of allowing some longitudinal movement of the bit within the chuck. The locking-pin, Fig. 3, has upon one end thereof an enlarged head 7, a body 8 of suflicient length to reach through the chuck, a contracted neck 9, and a conical head 10. After the pin has been inserted in position a specially-formed springclamp 11 is placed upon the neck 9, which secures the pin in position, thus locking the bit securely in place.

' Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A chuck for drills having a bit-socket extending longitudinally through the same,th'ere being a pin-hole through the lower end of said chuck intersecting said socket transversely, a pin adapted to occupy said hole, there being .a contracted neck at one end of said pin, a

clamp adapted to clamp said neck for the purpose set forth, in combination with a drill-bit having an elongated relief at one side thereof adapted to register with said pin-hole.

2. A chuck for drills having a bit-socket ex tending longitudinally through the same and a pin-hole extending transversely through the chuck and intersecting said socket, a pin adapted to occupy said pin-hole, a clamp adapted to engage one end of said pin, for ,the purpose specified, in combination with a bit having an elongated relief at one side thereof, adapted to the admission of said pin, and whereby said bit is adapted to a longitudinal movement within the socket.

In testimony whereof I aflix my signature in presence of two witnesses.

GEORGE H. GILMAN. Witnesses:

W. M. ARNOLD, D. HASTINGS. 

